Rob,
First, don't take this the wrong way, because I do think you guys are being very generous with the discount's very existence.
However, I disagree with the logic you're using behind "who gets the discount".
If someone was to have bought, say, FIVE units, only used one themselves, and sold the remaining four (as investments, say, knowing they would get a higher eBay return on them or something), and they never came out of the box and never got installed and were sold "as new", then how is this functionally different from any retailer situation? When the MkII goes to retail outlets (that is the goal, right?) are the retail outlets the only people who are going to be treated as "original customers"?
In that situation the "original purchaser" didn't "support Empeg", the guy he sold it to supported empeg, albeit using the original purchaser as a middle-man.
The reason I suggested the idea of a "proof of purchase" is to demonstrate (to the buyer) whether or not the unit is being purchased "as a new unit" (with all the rights and privileges of being "an original owner") or "as a used unit" (where the seller is recognized by Empeg as the "original owner" and the new owner may not be able to take advantage of other perks down the road).
You're REALLY going to want something like this when you start selling to retailers (or when retailers simply buy them from you and resell them in their stores without any "special retailer program"). e.g., if some company buys 20 MkII's and sells them in their store, for you to treat the new owner of the unit as "a second-hand owner" is a VERY questionable customer-service call.
That's what I'm aiming at. I'm not saying that this is a solution for the CURRENT problem, but it highlights an issue that should be addressed with greater clarity for the MkII units' distribution.